Balanced globe valve
AssigneeInvensys Building Systems, Inc.
InventorsIrving Erickson, Hongming Ge, Bonnie Dickinson
Life of this patent
Estimating the term…
Abstract
An essentially fully balanced plug valve is presented in which the flow control contour is interior to the moving member. The sealing edge of the moving member is at the exterior surface relative to the interior contour. This sealing edge is formed by use of matching angles on the interior of the moving member and the exterior of the stationary member. As a result, operation of the plug is fully balanced with the internal fluid pressure of the liquid therein. The sealing surface of the stationary member is positively retained therein to prevent blowout of the sealing surface. Should failure of the sealing surface occur, a secondary metal-to-metal seal will provide fluid containment albeit possibly at a reduced containment level.
Claims20
A balanced plug valve, comprising:
- a valve body defining a flow passage between an inlet and an outlet thereof;
- a valve seat;
- a balanced plug linearly movable relative to the valve seat for regulating a flow of fluid through the flow passage, the balanced plug having a first end exposed to fluid pressure from the inlet and a sealing end having a pressure balancing surface configured to be exposed to the fluid pressure from the inlet when in sealing engagement with the valve seat.
A balanced globe valve, comprising:
- a valve body;
- at least one valve seat positioned within the valve body;
- a balanced plug linearly movable within the valve body relative to the at least one valve seat for regulating a flow of fluid therethrough, the balanced plug having a generally cylindrical perimeter wall terminating in a first end and a second end, each of the first end and the second end including a surface configured to be exposed to a first fluid pressure when one of the first end and the second end is in sealing engagement with the at least one valve seat such that the fluid pressure on the perimeter wall in a direction tending to impede linear movement of the balanced plug is balanced by fluid pressure on the perimeter wall in a direction tending to aid linear movement of the balanced plug.
In a balanced globe valve having a valve body defining a flow passage between at least a first inlet and an outlet thereof and at least one valve seat fixably positioned within the valve body, a balanced plug linearly movable within the valve body relative to the at least one valve seat for regulating a flow of fluid between at least the first inlet and the outlet, comprising:
- a generally cylindrical perimeter wall terminating in a first end and a second end, each of the first end and the second end configured to expose a pressure balancing surface thereof to fluid pressure from the same one of the at least one inlet and the outlet such that the fluid pressure on the perimeter wall in a direction tending to impede linear movement of the balanced plug is balanced by fluid pressure on the perimeter wall in a direction tending to aid linear movement of the balanced plug when one of the first end and the second end is in sealing engagement with the valve seat.
Dependencies are inferred from the claim text.